Internet slow

Apple's Wireless Diagnostics may supply some additional helpful information. Run it on the MacBook exhibiting the trouble.

To use it, hold an option key while you click your Mac's Wi-Fi icon, and choose Open Wireless Diagnostics...

The following authentication dialog will appear:

Authenticate with your Admin password, then click the Continue button in the following:

The network analysis and diagnostic tests will take several minutes to complete:

When it completes, if your wireless network is functioning properly the following will result:

If something is amiss, supposedly the results will be different and you will be presented with helpful information.

Assuming your connection is "working as expected" select Continue to summary and click Continue:

Ignore the pre-populated text field, which is provided as a place for you to type in additional information should Apple ask for it in the course of obtaining technical assistance from them. Apple has no way of knowing where your router is located in your home, and certainly doesn't know if you even have an upstairs bedroom closet.

Click Continue.

The next step will also take a few minutes:

When it finishes, you will be presented with a summary that may or may not be useful to you. Let me know if it is.

The WirelessDiagnostics-xxx.tar.gz file deposited on your Desktop can be dragged to the Trash, or you may wish to expand it and examine its contents. It's up to you.

The diagnostic's Summary page is the one that might contain useful information:

If yours shows anything other than the above, follow its recommendations.

There really isn't very much of the WirelessDiagnostics report that is useful to anyone other than Apple's engineers. Most of its results are long, cryptic, and not worth posting.

Among the files it contains, the one titled wireless-diagnostics-xxxxxx.log file (where xxxxxx = random characters) is short enough to post in a reply, if you wish. Obscure or omit any information it contains that you consider personal.

The following is an example, which reveals nothing remarkable:

# --- Check Connectivity

# --- Wi-Fi Interface

Interface Name : en1

MAC Address : e4:ce:8f:

Network Name : A Series of Tubes 5GHz

Active PHY Mode : 802.11n

Security : Open

SSID : A Series of Tubes 5GHz

BSSID : 20:c9:d0:

Country : US

RSSI : -48 dBm

Noise : -96 dBm

Rate : 450 Mbps

Channel : 157

Channel Width : 40MHz

# --- Bluetooth

Power State : On

Paired Devices : 1

# --- Wireless Environment

2.4 GHz Networks : 1

5 GHz Networks : 2

Current Channel Networks : 1

Recommended 2.4GHz Channels : [ 11 1 2 3 4 5 7 8 9 10 ] 1

Recommended 5GHz Channels : [ 36 40 44 48 153 161 165 ] [ 149 157 ]

# --- Network Configuration

Primary IPv4 Interface : en0

IPv4 Address : 10.0.1.22

IPv4 Router : 10.0.1.1

Primary IPv6 Interface : None

IPv6 Address : None

IPv6 Router : None

DNS Servers : 10.0.1.1

# --- Debug Log Entries

06/19/14 12:09:54.0190 Current Wi-Fi network is an AirPort network

# --- Environment Test Cases

# --- Environment Summary

# --- Configuration Test Cases

06/19/14 12:10:10.2480 Wi-Fi interface en1 is not the primary IPv4 network interface.

# --- Configuration Summary

# --- Additional Information

06/19/14 12:10:24.2900

# --- Router Information

06/19/14 12:10:24.2900 Apple / Time Capsule w/ Simultaneous Dual-Band (5th Generation)

# --- Create Diagnostics Report

Failed to collect netstat output

I'm having the same problem on my Mac Mini, while all other computers in the house are fine. But my Mac OS (on Mac Mini) is 10.7.5, not Sierra so I don't have the option to run the Wireless Diagnostics app. What can I do to fix it? Thank you.